Zannetti Magnificum Black Chrono Purple realized by hand incising a sheet of brass, by means of burin engraving, and then gold or rhodium plated according to the colour of the enamel which will be used later on. Successively, a layer of coloured translucent enamel is applied by means of two different firing processes. Hence, the surface is hand polished. The subsidiary registers are hand applied in a second time.